//
// (C) Copyright 2009 Irantha Suwandarathna (irantha@gmail.com)
// All rights reserved.
//

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use _in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions _in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer _in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


using System;
using System.IO;
using System.IO.Compression;
using EffiProzDB.Lib;

namespace EffiProzDB.ScriptIO
{
    /**
     *
     *  @author fredt@users
     *  @since 1.7.2
     *  @version 1.7.2
     */
    public class ScriptWriterZipped : ScriptWriterBinary
    {

        private const int bufferSize = 1 << 15;

        public ScriptWriterZipped(Database db, string file, bool includeCached,
                           bool newFile)
            : base(db, file, includeCached, newFile)
        {

        }

        /**
         * Override the underlying method with no operation.
         */
        public override void sync() { }

        protected override void openFile()
        {

            try
            {
                HSQLFileAccess fa = database.getFileAccess();
                Stream fos = fa.OpenOutputStreamElement(outFile);

                outDescriptor = fa.GetFileSync(fos);

                fileStreamOut = new GZipStream(fos, CompressionMode.Compress);
            }
            catch (IOException e)
            {
                throw Trace.error(Trace.FILE_IO_ERROR, Trace.Message_Pair,
                                  new Object[] {
                e.ToString(), outFile
            });
            }
        }

        /**
         * This may not really be necessary, unless we add implementations where
         * non-compressed data is added to the end of the copressed part.
         */
        protected override void finishStream()
        {
            fileStreamOut.Flush();
            //((GZipStream)fileStreamOut).Close();

        }
    }
}